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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Expenses and Other Current Liabilities    
Accrued insurance $ 574 $ 452
Accrued royalty payments 2,393 2,212
Dividends payable 235 219
Other payables 305 483
Total $ 3,507 $ 3,366